Pecasa Ltd

Pecasa is a premium garden room, garden office, and annexe design-and-build specialist serving London, North London, and the Home Counties. The company focuses exclusively on fully bespoke outdoor buildings, designed from first principles to suit each client’s space, lifestyle, and long-term needs.

Unlike off-the-shelf garden rooms, every Pecasa project is custom-designed and engineered using high-performance Structural Insulated Panels (SIPs), delivering excellent thermal efficiency, structural strength, and year-round usability. This construction approach allows Pecasa buildings to comfortably function as full-time workspaces, studios, gyms, entertainment rooms, or self-contained garden annexes rather than seasonal structures.

Pecasa offers a fully managed, end-to-end service, starting with a free site survey and detailed design consultation. Clients receive bespoke layouts, 3D visualisations, and guidance on planning permission and permitted development requirements before construction begins. Installations are carried out by experienced in-house teams, ensuring consistent quality control from groundwork to final finish.

Design and material quality are central to Pecasa’s approach. Clients can choose from a wide range of premium external finishes including natural timber cladding, composite systems, and contemporary architectural detailing, paired with carefully specified insulation, glazing, electrics, lighting, and heating solutions. Internally, spaces are finished to a high residential standard, making them suitable for long-term daily use.